Problem of the Year

What values can you make using the digits from the year?

What values can you make using just the numbers of the year, in order, and the provided mathematical operations?

See if you can make every number from 1 to 30.

Click a button to add an operator tile, and then build up expressions by dragging the tiles on top of each other in the shaded area — the borders will turn red when combination is possible. (You can also drag two numbers together to join them.)

Click Save to store a copy of any complete expression in the box on the right.

(Note: The last button, with a shorter minus sign, is unary minus — for making negatives.)

Add '&year=nnnn' to the url to load with a particular year.